1. 用计算器计算前三题,试着写出后面几题的积。
$6×9 = $
$6.6×6.9 = $
$6.66×66.9 = $
$6.666×666.9 = $
$6.6666×6666.9 = $
$6.66666×66666.9 = $

1. 54 45.54 445.554 4445.5554 44445.55554 444445.555554

2. 用计算器计算每小题中的前三个得数,用发现的规律直接写出后面的得数。
(1)$1÷37 = $
$2÷37 = $
$3÷37 = $
$4÷37 = $
$5÷37 = $
(2)$9×9 + 7 = $
$98×9 + 6 = $
$987×9 + 5 = $
$9876×9 + 4 = $
$98765×9 + 3 = $
$987654×9 + 2 = $
$9876543×9 + 1 = $
(3)$1234567×9 + 8 = $
$123456×9 + 7 = $
$12345×9 + 6 = $
$1234×9 + 5 = $
$123×9 + 4 = $
$12×9 + 3 = $
$1×9 + 2 = $

2.（1）0.$\dot{0}$2$\dot{7}$ 0.$\dot{0}$5$\dot{4}$ 0.$\dot{0}$8$\dot{1}$ 0.$\dot{1}$0$\dot{8}$ 0.$\dot{1}$3$\dot{5}$ （2）88 888 8888 88888 888888 8888888 88888888 （3）11111111 1111111 111111 11111 1111 111 11

1. $0.2$ $0.04$ $0.008$ ( ) ( ) ( )

1. 0.0016 0.00032 0.000064

2. $3.48$ $1.74$ $0.87$ ( ) ( ) $0.10875$

2. 0.435 0.2175